<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>06_列表渲染_过滤与排序</title>
</head>
<body>
<!--
1. 列表过滤
2. 列表排序
-->

<div id="demo">
    <input type="text" v-model="searchName">
    <ul>
        <li v-for="(p, index) in filterPersons" :key="index">
            {{index}}--{{p.name}}--{{p.age}}
        </li>
    </ul>
    <div>
        <button @click="setOrderType(2)">年龄升序</button>
        <button @click="setOrderType(1)">年龄降序</button>
        <button @click="setOrderType(0)">原本顺序</button>
    </div>
</div>

<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
    new Vue({
        el: '#demo',
        data: {
            searchName: '',
            orderType: 0, // 0代表不排序, 1代表降序, 2代表升序
            persons: [
                {name: 'Tom', age: 18},
                {name: 'Jack', age: 17},
                {name: 'Bob', age: 19},
                {name: 'Mary', age: 16}
            ]
        },

        computed: {
            filterPersons() {
//        debugger
                // 取出相关数据
                const {searchName, persons, orderType} = this
                let arr = [...persons]
                // 过滤数组
                if (searchName.trim()) {
                    arr = persons.filter(p => p.name.indexOf(searchName) !== -1)
                }
                // 排序
                if (orderType) {
                    arr.sort(function (p1, p2) {//返回值为正数  p2在前面 返回值为负数 p1在前面
                        if (orderType === 1) { // 降序
                            return p2.age - p1.age
                        } else { // 升序
                            return p1.age - p2.age
                        }

                    })
                }
                return arr
            }
        },

        methods: {
            setOrderType(orderType) {
                this.orderType = orderType
            }
        }
    })
</script>
</body>
</html>